Question: When was the population of Burkina Faso 8.57982e+06?
Paraphrase: At what time did Burkina Faso have a population of 8.57982+06?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q965 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '8.57982e+06')) . ?s pq:P585 ?value}